The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
According to the low yield of propylene existing in gas fractionation device due to higher C2 content in LPG, the factors affecting on LPG quality in the absorbing-stabilizing system were analyzed. Some technics such as optimization of operating condition and energy-efficient process were adopted to intensify the separation effect, offering the advice with lower C2 content (no more than 0.1%χ) in...
Objective To study the prescription and preparation technology of Prunella ethanol extract dispersible tablets. Methods Take disintegration time as indexes, the prescription and preparation technology were optimized by an orthogonal design. The hardness, suspended uniformity, dissolution were investigated and preliminary stability were tested through accelerated test. Results The optimum prescription...
Synthesis of n-butyl lactate catalyzed by carbon nanotube pured liquid oxide was studied. The influence of the amount of catalyst, catalytic reaction time and temperature on the conversion rate of lactic acid was discussed. The synthesis conditions of n-butyl lactate are as follows: the ratio alcohol to acid is 2∶1, the amount of catalyst is 0.5 g/0.1mol lactic acid, the reaction time is 2.0 h and...
The grey theory and fuzzy theory combined assessment decision model were constructed for shan-meng expressway soft foundation treatment based on the grey theory and fuzzy theory, which considers the uncertain and fuzzy character of engineering geology, engineering cost, construction technique, effect of improvement and engineering reliability. The weights of affecting factor are calculated by improved...
Changsha-zhuzhou-xiangtan urban agglomeration and Zhongyuan urban agglomeration are two important central dense regions in the central area of China. This paper adopts some methods such as comparative analysis, establishment abstraction mathematical model by the fractal theory to comparison and analysis the spatial structure of the two urban agglomeration, and strive to find the advantage and disadvantage...
This paper studied the efficiency of the oilfield water injection system by using the water injection system theory, fluid mechanics theory, and graph theory and optimization design technology. According to the actual conditions, the paper established the mathematical model of Wuliwan oilfield pipe network. Based on the actual data of production, energy distribution of oilfield water injection system...
10000KN fine blanking presses is a kind of large-scale Forging equipment, which support immense pressure and stamping frequency in the process. The deformation and vibration of the fine blanking press frame have direct relationship with the tool life and the component precision. Therefore, the high structural stiffness and the good dynamic performance are predominant requirements for the reliability...
In this paper, a numerical optimization of a radial turbine impeller is developed, which combines popular techniques such as artificial neural networks, genetic algorithm, database and CFD analysis tools. Multi-objective aerodynamic optimization is performed by using software FINETM/Design 3D. The performance parameters in the terms of total-to-static efficiency, expansion ratio are defined as optimized...
One practical method to increase the density of Habrotrocha sp., which is a kind of useful bdelloid rotifer in the wastewater biological treatment system, is to cultivate the metazoa in certain numbers and then put it into the treatment system. Therefore, it is necessary to develop a method which can efficiently cultivate Habrotrocha sp‥ In this paper, the optimization of culture condition for Habrotrocha...
[Objective] The research aimed to optimize extraction process of total flavonoids from Pteridum aquilinum var.latiusculum and provide a theoretical basis for development and utilization of total flavonoids from Pteridum aquilinum var.latiusculum. [Method] Taking the yield of total flavonoids as index, the orthogonal test L16 (44) with four factors and four levels was used to optimize the technological...
Dibutyl phthalate is one of major plasticizer, which has detrimental effects on human health. Extraction is an important method to treat high concentration dibutyl phthalate. In order to optimize the extraction condition of treatment high concentration dibutyl phthalate, this article firstly compared the efficiency of five different extraction agents including carbon tetrachloride, benzene, isooctanol,...
Theory and application of water and wastewater network optimization was researched borrowing ideas from water pinch technology. A new water system optimization method was advanced and a water system optimization model was built. The new water system optimization method was based on mass transfer model of water pinch technology, every operation used matched water of circle water and fresh water in...
To improve dredging efficiency and expand transportation, trailing suction dredger with shuttle barge moored at one side is applied in long distance reclamation projects. Line arrangement and line tension estimation method is established for prototype testing of this new technique. The variation rule of line tension in different operation stage is studied and a program working on optimal relative...
In this work, to improve ethanol fermentation based on 300 g·L−1 initial glucose, the statistical approaches were employed to optimize the fermentation conditions. Plackett-Burman design was used for the initial screening, and (NH4)2SO4, KH2PO4 and inoculum size were identified to be the significant variables. The three variables were chosen for further optimization by central composite design of...
The mining face in the Twelve Mine belong to Pingdingshan Colliery Group Co. LTD is immerged in the depth of 1015m between 1130m. Extraction Scheme of Protective Seams was used as the key technology. So the law of mine pressure in the tunnel below should be further researched. To the actual actual conditions, the three-dimensional model was build using the FLAC3D. The mine pressure in the tunnel below...
This work focused on purification process of crude alcoholic extract from mulberry leaves using macroporous absorbent resin. Firstly, ten kinds of resins, D4020S-8, XAD-16, AB-8, H103, NKA-9, D101, NKA-II, NKA and X-5, were selected as absorbent materials based on maximization of absorbent and desorbent capability. Through static adsorption and desorption, NKA was chosen as the best purification material...
Since the province of Yunnan carried out weight calculating program, We have achieved preliminary accomplishments on administering overload and over limit transportation, decreasing traffic accident happening, highway property protecting. But, as the result of our province implement this program still very short, there are many problems in practical experience and these problems needs to be resolved...
The structure optimization design of bridge crane based on HyperWorks is studied in this paper. The girder structure of the bridge crane can affect the performance of the bridge crane to certain extent. Based on the structure optimization technology of HyperWorks, the topological optimization, shape optimization and size optimization for one 50t bridge crane have been researched. The analysis results...
With the development of satellite-positioning technology and people's desire for higher positioning accuracy, the current reference-centric coordinate system will be difficult to meet the demand.
The establishment of the municipal sewage plants has significantly improved the urban water environment, while their tail water has a certain impact on urban river's water quality, especially on the near-field. Currently, there are two main discharge modes of the tail water, namely centralized and decentralized discharges. As the increase of river restoration projects, for example riverbank treatment...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.